Hi all,
Having lived with a 3-way speaker system for 6 years which has a 10" sealed-box woofer, I decided to try to design one or two more 3-ways with sealed box woofers, but with passive crossovers this time. This means of course that I won't get the benefit of Linkwitz Transform. So I started looking around for woofers which would show a modelled F10 down to the 20s Hz with a Q of 0.6. And since this is a 3-way design, I didn't care about 6.5" or even 8" for my woofers -- I wanted 10" or bigger. The only constraint on the woofer size would be that it should mate smoothly with a mid at something like 300Hz.
Why F10? I believe that with a lowish Q like 0.6, F10 is a realistic indicator of the in-room bass extension.
So, I started looking around, discovered the Peerless NE315W-08 and discovered that it looks like a very well built driver but has hardly been reported on on diyaudio. So it led to this thread where I got a lot of good pointers.
In the process, I realised that one needs a ready reckoner of speaker drivers with their F10 at specific Q, if I am going to be a sealed-box-woofer-based speaker designer. So I decided to compile such a list and keep it there for future reference. It's extremely tedious to open Unibox each time when you're thinking of driver X or Y, set up the Q to 0.6, and peer at the graph to see what the F10 will be.
My list is here on Google Drive. I intend to keep maintaining the list. If you have some drivers to add, just let me know, I'll plug the data into Unibox and add a row to the spreadsheet.
It's interesting to see
(Ignore the tick marks -- those are just my personal shortlist of interesting drivers.)
Hope the list helps some of you. Comments welcome, of course.
Update: just after starting this thread, I found another related interesting thread: 0.707 Qtc and Mms
Having lived with a 3-way speaker system for 6 years which has a 10" sealed-box woofer, I decided to try to design one or two more 3-ways with sealed box woofers, but with passive crossovers this time. This means of course that I won't get the benefit of Linkwitz Transform. So I started looking around for woofers which would show a modelled F10 down to the 20s Hz with a Q of 0.6. And since this is a 3-way design, I didn't care about 6.5" or even 8" for my woofers -- I wanted 10" or bigger. The only constraint on the woofer size would be that it should mate smoothly with a mid at something like 300Hz.
Why F10? I believe that with a lowish Q like 0.6, F10 is a realistic indicator of the in-room bass extension.
So, I started looking around, discovered the Peerless NE315W-08 and discovered that it looks like a very well built driver but has hardly been reported on on diyaudio. So it led to this thread where I got a lot of good pointers.
In the process, I realised that one needs a ready reckoner of speaker drivers with their F10 at specific Q, if I am going to be a sealed-box-woofer-based speaker designer. So I decided to compile such a list and keep it there for future reference. It's extremely tedious to open Unibox each time when you're thinking of driver X or Y, set up the Q to 0.6, and peer at the graph to see what the F10 will be.
My list is here on Google Drive. I intend to keep maintaining the list. If you have some drivers to add, just let me know, I'll plug the data into Unibox and add a row to the spreadsheet.
It's interesting to see
- the correlation between sensitivity, moving mass, and bass extension. All the subwoofers have heavy cones and are low on sensitivity. It's really hard to get deep bass extension out of a SET valve amp -- it seems you must pump in power to get low bass, if you want to work with sealed enclosures.
- the Peerless 830668 and 830669, with their crazy box volumes for Q = 0.6. I wonder what makes their boxes that large. The 830669 doesn't give up even at Q = 0.7 -- it pushes the box size to 194 litres!
- the Dayton DS series woofers -- they seem to be extremely good value for money, and fairly good in absolute terms, and even their 15" driver can probably be mated to a 5" midrange at 300Hz.
(Ignore the tick marks -- those are just my personal shortlist of interesting drivers.)
Hope the list helps some of you. Comments welcome, of course.
Update: just after starting this thread, I found another related interesting thread: 0.707 Qtc and Mms
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This is the kind of insight I am always looking for. What are the consequences of a weak motor on the performance? I too had noticed that Qes was high.
To be precise, the weak motor relative to the cone mass is the reason for high Qes.
In my opinion, weaker motor drivers (relative to the mms ofc.) sounds somewhat softer than the stronger motor drivers. That's a subjective thing which may depend on many other factors and is therefore subject to reservations.
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